A quantitative criteria for the coincidence problem |
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Authors: | Hongsheng Zhang Heng Yu Zong-Hong Zhu Yungui Gong |
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Institution: | 1. Department of Astronomy, Beijing Normal University, Beijing 100875, China;2. College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;3. Kavli Institute for Theoretical Physics China, CAS, Beijing 100190, China |
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Abstract: | The cosmic coincidence problem is a serious challenge to dark energy model. We suggest a quantitative criteria for judging the severity of the coincidence problem. Applying this criteria to three different interacting models, including the interacting quintessence, interacting phantom, and interacting Chaplygin gas models, we find that the interacting Chaplygin gas model has a better chance to solve the coincidence problem. Quantitatively, we find that the coincidence index C for the interacting Chaplygin gas model is smaller than that for the interacting quintessence and phantom models by six orders of magnitude. |
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Keywords: | 95 36 +x |
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